US Patent 10172482 Shelf management device

A shelf management device including a guide member having a front end and a rear end, and a pusher device guided for movement by the guide member. Wherein the pusher device includes a rotatable spool upon which is wound a flexible drive member, an end part of the drive member being secured to the guide member at or adjacent the front end thereof. A spring is provided to urge the spool for rotation to take up the drive member and thereby apply a load to the pusher device urging the pusher device towards the front end of the guide member.